diff options
| author | Jordan Crouse <jcrouse@codeaurora.org> | 2019-09-11 08:32:15 -0600 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2019-09-17 02:18:24 -0700 |
| commit | 5ffb9e5b7a80805f6e6c504cdd1d70d6411b51ab (patch) | |
| tree | 85a5117ccf7de1adf4eb647598ac6ce86869da33 /drivers/gpu/msm/kgsl_iommu.c | |
| parent | 19f118bcf52ba3ee9d9e89ca1e6ad01215e245ac (diff) | |
msm: kgsl: Make the "scratch" global buffer use a random GPU address
Select a random global GPU address for the "scratch" buffer that is used
by the ringbuffer for various tasks.
Change-Id: Ic0dedbaddda71dbf9cb2adab3c6c33a24d6a604c
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Harshitha Sai Neelati <hsaine@codeaurora.org>
Diffstat (limited to 'drivers/gpu/msm/kgsl_iommu.c')
| -rw-r--r-- | drivers/gpu/msm/kgsl_iommu.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c index 30f7c9543e38..ffab5423d694 100644 --- a/drivers/gpu/msm/kgsl_iommu.c +++ b/drivers/gpu/msm/kgsl_iommu.c @@ -20,6 +20,7 @@ #include <linux/msm_kgsl.h> #include <linux/ratelimit.h> #include <linux/of_platform.h> +#include <linux/random.h> #include <soc/qcom/scm.h> #include <soc/qcom/secure_buffer.h> #include <stddef.h> @@ -198,7 +199,7 @@ static void kgsl_iommu_remove_global(struct kgsl_mmu *mmu, static void kgsl_iommu_add_global(struct kgsl_mmu *mmu, struct kgsl_memdesc *memdesc, const char *name) { - int bit; + u32 bit, start = 0; u64 size = kgsl_memdesc_footprint(memdesc); if (memdesc->gpuaddr != 0) @@ -207,10 +208,26 @@ static void kgsl_iommu_add_global(struct kgsl_mmu *mmu, if (WARN_ON(global_pt_count >= GLOBAL_PT_ENTRIES)) return; - bit = bitmap_find_next_zero_area(global_map, GLOBAL_MAP_PAGES, - 0, size >> PAGE_SHIFT, 0); + if (WARN_ON(size > KGSL_IOMMU_GLOBAL_MEM_SIZE)) + return; + + if (memdesc->priv & KGSL_MEMDESC_RANDOM) { + u32 range = GLOBAL_MAP_PAGES - (size >> PAGE_SHIFT); + + start = get_random_int() % range; + } + + while (start >= 0) { + bit = bitmap_find_next_zero_area(global_map, GLOBAL_MAP_PAGES, + start, size >> PAGE_SHIFT, 0); + + if (bit < GLOBAL_MAP_PAGES) + break; + + start--; + } - if (WARN_ON(bit >= GLOBAL_MAP_PAGES)) + if (WARN_ON(start < 0)) return; memdesc->gpuaddr = |